Micro-Ohmmeter Model 6255

The 10 A Micro-Ohmmeter Model 6255 is a rugged, low resistance tester designed for both plant maintenance and field use. Utilizing a four-lead Kelvin method, the Model 6255 is the most accurate Micro-Ohmmeter available, with results within 0.05%. It can test up to 60 minutes continuously at  10 A.

The Model 6255 is uniquely designed to conduct tests on both resistive and inductive material, with operator selection directly from the front panel. Three test modes are available; resistive (instantaneous test), inductive (continuous test), and auto (repetitive test). Up to 1500 measurements can be stored and printed directly to a printer from a PC.

The DataView® Software included allows you to configure the instrument, store data and print reports.

▶ Learn how to properly connect leads to AEMC® Instruments Micro-Ohmmeters (Models 6240, 6250 & 6255)

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Model 6255 (with leads) - Cat. #2129.84: Extra large tool bag, set of (2) 10 ft Kelvin Clips (10 A - Hippo), set of (2) 10 ft Kelvin Probes (1 A - Spring Loaded), RS-232 DB9 F/F 6 ft null modem cable, RS-232 to USB adapter, US 115 V power cord, NiMH rechargeable 6 V battery pack (installed in meter)*, Quick Start guide and a USB thumb drive with DataView® software and a user manual.

*Can be charged during operation

Specifications

Measurement Range
Range	Resolution	Accuracy @ 23 °C ± 5 °C	Measurement Current	Voltage Drop
5 mΩ	0.1 µΩ	±(0.15 % +1.0 µΩ)	10 A	50 mV
25 mΩ	1 µΩ	±(0.05 % +3 µΩ)	10 A	250 mV
250 mΩ	10 µΩ	±(0.05 % +30 µΩ)	10 A	2500 mV
2500 mΩ	0.1 mΩ	±(0.05 % +0.3 mΩ)	1 A	2500 mV
25 Ω	1 mΩ	±(0.05 % +3 mΩ)	100 mA	2500 mV
250 Ω	10 mΩ	±(0.05 % +30 mΩ)	10 mA	2500 mV
2500 Ω	100 mΩ	±(0.05 % +300 mΩ)	1 mA	2500 mV
Temperature Measurement	3 wire 100 Ω platinum RTD
Accuracy	±0.5 °C
Resolution	0.1 °C
Selectable Metal Type	Yes – Copper, Aluminum or Custom
Alarm Mode	Yes – 2 Alarms with High-Low trigger
Storage Memory	1500 tests, supplied with DataView® software for download and reporting
Battery	Rechargeable NIMH battery pack 6 V, 8.5 A•h
Battery Life: 10A	≥ 5000  tests typical
Battery Charger	120/240 VAC ± 20 % (45 to 400) Hz
Auto Power OFF	When battery voltage <5.0 V
Overload Protection	250 Vrms
Dimensions (L x W x H)	(10.70 x 9.76 x 7.18) in (272 x 248 x 182) mm
Weight	8.1 lbs (3.69 kg)
IP Rating	IP64 (with cover closed) IP53 (with cover open)
Altitude Operating	2000 m
Operating Temperature	(14 to 131) °F (-10 to 55) °C & (10 to 80) % RH
Storage Temperature (without battery)	(-40 to 140) °F (-40 to 60) °C & (10 to 90) % RH
Safety	IEC/EN 61010-1 50V CAT III Pollution 2

User Manuals

Model 6255

Spring-Loaded 25 A Test Probes - EN, ES, FR

Battery-Pack-Replacement-Instructions_6250-6255

Micro-Ohmmeter Models 6240 / 6255 / 6250 - Verification via a ZERO Test - English

Battery Recharge Time / Rechargeable NiMH Notice

Kelvin Probe Lead Connection for Micro-Ohmmeters

Tiempo de recarga de las baterías / Aviso de NiMH recargable 

Quick Start Guides

Model 6255

Datasheets

Model 6255 - English

Modelo 6255 - Español

Brochures

Micro-Ohmmeter Brochure

Ground Resistance Testers Brochure

Grounding Traffic Control Signal Equipment Simplified

AEMC® Instruments Product Line Brochure

Comparison Charts

Micro-Ohmmeter Comparison Chart

Micro-Ohmmeter Comparison Chart - Español

Software

Micro-Ohmmeter Software

Application Notes

Measuring Resistance/Impedance with the Four-Wire Kelvin Method

Forms

Stored Measurement Results Form

Micro-Ohmmeter Measurement Result Form

Calculators

Slope Method Calculation - Automated way of calculating the S electrode placement when using the slope method - Excel

Three Measurement Method

Cálculo por el método de la pendiente – Forma automatizada de calcular la ubicación del electrodo S al usar el método de la pendiente - en una hoja de cálculo de Excel

Technical Bulletins

Watts Current Issue 16

Troubleshooting

Model 6255 Error Codes

Applications - Graphic Illustrations

Power Distribution (Switchgear)

Data Centers